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POHow to change framerate when using MediaRecorder Class
 

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  1. POHow to change framerate when using MediaRecorder Class
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    <p>I try to record video using MediaRecorder Class.</p> <p>However I find out that I failed to lower the framerate of the video stream.</p> <p>I'm using H.264 as my Video Encoder and AAC as my Audio Encoder(yes, it is supported in API LEVEL 10 and above, AKA Android 2.3.3+) The main source is as follows.</p> <pre><code>recorder = new MediaRecorder(); recorder.setPreviewDisplay(surfaceHolder.getSurface()); recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); recorder.setAudioSource(MediaRecorder.AudioSource.MIC); //set the Output Format recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); //set the Video Size recorder.setVideoSize(176,144); //set the Frame rate recorder.setVideoFrameRate(15); //Set the Video Encoder recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); //Set the Audio Encoder recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC); recorder.setOutputFile(myRecAudioFile.getAbsolutePath()); recorder.prepare(); recorder.start(); </code></pre> <p>However I got the debug info that:</p> <pre><code>03-22 22:39:41.120: WARN/StagefrightRecorder(662): Intended video encoding frame rate (15 fps) is too small and will be set to (27 fps) </code></pre> <p>Weird enough that I also got a error message that:</p> <pre><code>03-22 22:39:41.380: ERROR/VENC_ENC(662): Bitrate 192000 </code></pre> <p>In the end, i got a mp4 file whose frame rate is nearly 28fps.</p> <hr> <p>I also tried to use the lowest CamcorderProfile which is </p> <pre><code>recorder = new MediaRecorder(); recorder.setPreviewDisplay(surfaceHolder.getSurface()); recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); recorder.setAudioSource(MediaRecorder.AudioSource.MIC); //replacement CamcorderProfile cpLow = CamcorderProfile.get(CamcorderProfile.QUALITY_LOW); recorder.setProfile(cpLow); recorder.setOutputFile(myRecAudioFile.getAbsolutePath()); recorder.prepare(); recorder.start(); </code></pre> <p>and comment the verbose configuration of the recorder.</p> <p>As the book <em>Pro Android Media</em> is Page 242 said I would got the video file with 15fps. However, I once again got a video file with about 27fps.</p> <hr> <p><strong>So how to lower the frame rate of a video?</strong> I'm building a live system so lowering bitrate got to be quite important to me. Thank you for your time!</p>
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